Furnace construction



April 8, 1930. F, wAlTE ET Al.

FURNACE CONSTRUCTION Filed Nov. 13, 1925 4 Sheets-Sheet .dmw, j; and@'F'r 5.11.12. H NN'D. jc E EEmLEEVvCDm- Ej IN VEN TORS on 3y M A TTORNEY April 8, 1930. F. H. wAlTE ET AL 1,753,842

FURNACE CONSTRUCT ION Zwaan/grs M75/m15:

Filed Nov. 13. 1.925 4 sngts-sheet md.. h

EEDYEEWDDN' INVENTORS 'y- CWM ATTORNEY April 8, 193Q. H wAlTE ET AL1,753,842

FURNACE CONSTRUCTION Filed Nov. 13, 1925 4 Sheets-Sheet 4 i ATTORNEYPatentedv Apr. 8,Y 1930 1 UNITED STATES vPATENT OFFICE FRANK H. AND'GEORGE DAVEY, 0F LONG/ISLAND CITY, NESW 'YORK FURNACE CONSTRUCTION lApplication filed November 13, 1925. Serial No. 68,87'8.

Our invention relates to furnace construct1on, and contemplates theprovision of simple and efficient means for preheatingair yforcombustion and'delivering it to the furnace,

5 while at the same time protecting the refractories. By ourconstruction there are a plurality of co-oper-ating although separate,and distinct circulations of air employed in addition to theairsupplied by a `blower in the usual way, two of the circulationsbeingdirected throughout the side walls into the combustion chamber and athird circulation throughout the air cooledV arch entering the throat ofthe furnace. Y Y l5 This is accomplished by utilizing the heat transferfunction of our air cooled refractory furnace blocks, specificallyillustrated, described and claimed in our application bearing SerialNumber 55,7 52,l led September 11th, 1925. 1

We also utilize the horizontal and vertical expansion means illustrated,described and claimed in our pending applications, led- September 29th,1925, bearing Serial Number 59,440 and in the application filed. October15th, 1925, bearing Serial Number 62,630. One object of our invention isto circulate air under pressure throughout the side walls of a stokerfurnaceand force the preheated 30 air into the combustion chamberadjacent to the stoker grate and simultaneously circulate air through anair cooled arch.

Another object of our invention is to cirlculate air under pressurethroughout the side walls of a stoker furnace by the suction of alblower or fan and force this preheated' air under the grate of a stokerinto and through'- out the combustion chamber,- simultaneously forcingair throughout an arch into the throat 40 of the said furnace.

Other valuable features of our invention and the unique applications ofthe circula` tions are described, pointed out and illustrated in theaccompanying drawings, where- 5 in like numerals indicate like parts, in

which v Figure l'is a longitudinal section of a water tube boiler Stokerfurnace.

Figure 2 is a cross section on the line 2-2 5 of Figure 1. f f

vFigure 3 is a typical section of part of the wall adjacent to the grateand taken onthe line 3-3 of Fig. l.

Figure 4 is a longitudinal section of a water tubeboiler stoker furnaceillustrating a modication.

Figure 5 is a cross section on the line 5-5 of Figure 4.

Figure 6 is a partial horizontal section 'on line 6-6 of Figure 1. 60Figure 7 is a partial horizontal section on line 7-7 ofA Figure 4.

Figures 1, 2, 3 and 6 illustratea water tube boiler stoker furnaceconsisting of a' front wall 1, Side walls 2 and 3, bridge wall 4, water65 tubes 5, a drum 6, an angular baile 7, a vertical baiiie 8, a gasoutlet 9, a clean' out opening 10, a grate 11, a combustion chamber 12,

a Stoker mechanism 13, a coal hopper 14, a blower or fan 15, a wind box16 and an 70 arch 17.

There are four separate and distinct circulations of air throughout thewalls, arch and the furnace, illustrated in Figures 1, 2,

3 and 6, two of which circulate under the 75 pressure of a fan or blowerthroughout the sidewalls, cooling the interior of the furnace or thatportion of'the furnace built up of a seriesk of superimposed, brokenjointed air cooled refractory blocks and the air preheatso ed in transitthroughout said walls is utilized as preheated air at a part adjacent tothe grate, for a more perfect combustion of the fuel. I

In the third circulation the 'air from the 85 blower is forcedthroughout the air cooled refractory blocks of an arch and injected intothe furnace above the arch or into the throat of the furnace.

In the fourth circulation, illustrated in Figures 1, 2, 3 and 6, the airfrom the blower enters-the wind box, passes under the stoker grate,through an elbow provided with a regulating damper, flows upwardlythrough the grate and fuel bed into the combustion chainber, through thethroat around the tubes, drum and baffles to the gas outlet and stack.

In the first circulation throughout wall 3, illustrated in Figures 1,-2,3 and 6, the air from the blower 15 driven by the motor 19 100 and belt18 passes through a pipe or conduit 27 into the Wind box 16, from whenceit flows into the duct 22 provided with a volumetrically controllabledamper 67 within the wall 3, enters the duct 23, flows horizontally atright angles to the flow of aming gasses within the combustion chamber12, throughout the wall 3 (which is provided with horizontal bafiies 28and 29, vertical expansion means 30, horizontal expansion means 31 and32), thence downwardly and then laterally through interstices 33 in thebrick work of the wall under the air cooled refractory blocks 24,adjacent to the grate 11, into the combustion chamber 12, as clearlyshown in Figures 1, 2, 3 and 6. l

The wall 3 as well as the wall 2 isbuilt up of a series of superimposed,broken jointed air cooled refractory blocks 24, illustrated in Fi ures 2and 6.

n the second circulation, throughout wall 2, illustrated by Figures 2, 3and 6, the airv from the blower 15,' driven by the motor' 19 and belt18, passes through the pipe or conduit 27, into the wind box 16, fromwhence it flows into the duct 34 provided with a volumetricallycontrollable damper 68, within the wall 2, enters the duct 35, flows ina horizontal direction throughout the wall 2, directed by the horizontalbales 36 and 37, flowing at right angles to the flow of aming gaseswithin the combustion chamber 12, and

finally enters the combustion chamber 12 at a point adjacent to thegrate 11 through the interstices 33 in the brick workconstituting partof the wall 2 and supporting the air,

cooled blocks 24.

In the thir'd circulation illustrated in Figures 1, 2, 3 and 6, the airfrom the blower 15 passes into the conduit or pipe 27, enters theconduit or pipe 38 flowing upwardly into the manifold 40 through theelbow 39, the Volume of air being controlled or regulated byfthe damper54 in pipe or conduit 38.

From this manifold 40, theair under pressure of theblower 15 passesthroughout the arc 17 which is made up of a series ofv unit blocks 53,each having a flue 41 therein, into another manifold 42, common to allthe lues 41, from whence it passes, preheated, after cooling the arch intransit therethrough, into another manifold 44, through the flue 43.

The lpreheated air thus collected by the manifold 44 is directed intothe throat 46 of the furnace by a multiplicity of iu'es, ducts orpassages 45;

In the fourth circulation as illustrated by Figures 1, 2, 3 and 6, theair from the blower or fan 15 passes into the wind box 16 through theconduit or flue 27 under the grate 11, through the elbow 20, providedwith a damper, valve or'equivalent 21'controlling the volume of air fromthe wind box 16.

The air thus forced under the grate '11 passes upwardly through thegrate and fuel thereon, into the combustion chamber 12, up-

wardly through the lthroat 46, around tubes 5, and drum 6, over baille7, downwardly around tubes 5 under bale 8, upwardly around tubes 5 anddrum 6 to gas outlet 9 from whence it goes to the stack.

. Figures 4, 5 and 7 illustrate modified circulations of air as appliedto a water tube boiler stoker furnace, one circulation passingthroughout one side wall to the inlet side of the blower, onecirculation passing throughout the other side wall to the inlet side ofthe blower, the third passing from the blower throughout the arch intothe throat of the furnace while the first and second circulations passthrough the-blower and throughout the furnace as hereinafter more fullydescribed. The greater part of the air the blower sucks in, preheated intransit throughout each side wall is forced under the grate into thecombustion chamber throughout the furnace, while the lesser part isforced throughout the arch into the throat of the furnace.

In the first circulation illustrated by Figures 4, 5, and 7, the airenters the side wall 3, composed of a. series of superimposed, brokenjointed air cooled refractory blocks 24, having horizontal flue 25 andvertical flues 26 therein, through a multiplicityl of lues each providedwith a damper 69 and slide 70 into the u per horizontal flue, passesdownwardly in a irection opposite to the flow of flaming gases withinthe combustion chamber 12, into a common manifold 57, from whence theair preheated in transit throughout the wall 3 enters the inlet side ofthe blower 15 being directed by the conduits 58, 59 and 60, elbowsl 61,62 and 63 and T 65, the greater part of the air from the wall 3 thuspreheated being forced through the duct 27 into the wind box umetricallyregulatable damper 21, under the grate 11, upwardy into thel combustionchamber 12, through the throat 46, upwardly around the tubes 5 and drum6, over baffle 7, downwardly around tubes 6 under baffle 8, upwardlyaround tubes 5 and drum 6 through the gas outlet 9, to the stack.

In the second circulation illustrated in Fi ures 4, 5 and 7the airenters the side wa 2, of similar construction as hereinbefore de- 16,through the elbow 20, provided with a vols into the'wind box 16 throu hthe conduit or 'i flue 27 under the grate 11, t ough thev elbow 20,provided with a volumetrically regulatable damper 21, passes upwardlyinto the combustion chamber 12, through thel throat 46 around the tubes5 and drum 6, over bales 7, downwardly around tubes 5, under baiile 8,upwardly around tubes 5 and drum 6, through the gas inlet 9 to thestack.

In the third circulation a portion of the air from the blower 15, whichis sucked in and throughout the walls 2 and 3 is forced upwardly in theconduit 38, having a volumetrically controllable damper 54, throughelbow 39, into manifold 40, throughout the arch 17, composed of a seriesof unit air cooled refractory blocks each having a iiue 41 therein, to amanifold 42, which like manifold 40 is common to all the flues 41, fromwhence the air preheated in transit is directed to manifold 44 throughthe duct 43, from whence the air is directed into the throat 46 of thefurnace through a multiplicity of ducts, flues or let 9 to the stack.

In Figures 1, 2, 3,14, 5, 6 and 7 the preheated air from the walls isutilized for a more complete combustion of the products of combustion inthe combustion chamber and the preheated air for the arch is utilized inthe throat of the furnace above the combustion chamber.

Having thus described and illustrated the preferred embodiment ofour-invention we do not desire to limitourselves to the exact subjectmatter pertaining to the specific circulations and combinations thereofdisclosed herein, as modifications may be made Without departing fromthe spirit of the invention or the scope of the claims.

We claim 1. A furnace construction comprising, in combination,channelled refractory walls and a channelled refractory roof forming acomf bustion chamber, means for admittingfuel to,

l no

Athe chamber, an oiftake therefrom, a forced draft creating means, airinlet means and outlet means for the channel system of said roof,separate air inlet and outlet means for said wall channels, direct airdelivery means from said drafter to said chamber, and means connectingsaid roof'and wallchannel systems with said drafter forming indirect airdelivery means whereby air from the inlets is forced through saidsystems, for preheating it and cooling .the refractories,'and by way ofsaid outlets to the chamber.

combination, .channeled refractory walls and roof, separate air inletand outlet means for said wall channels, direct air delivery means fromsaid drafter to said chamber, and means connecting said roof andl wallchannel systems with said drafter forming indirect air delivery meanswhereby air from the inlets is forced through said systems, forpreheating it and cooling the refractories, and by way of said outletsto the chamber, together with independent air control valves for thedirect delivery means and the channel systems.

3. A furnace construction comprising, in combination, channelledrefractory Walls and a channelled refractory roof forming a combustionchamber, means for admitting fuel to the chamber, an oiftake therefrom,a forced draft creating means, air inlet means and outlet means for thechannel system of said roof, separate air inlet and outlet means forsaid wall channels, direct air delivery means from said drafter to saidchamber, and means conn ecting said roof and wall channel systems withsaid drafter forming indirect air delivery means whereby air from theinlets is forced through said systems, for preheating it and cooling therefractories, and by way of `said outlets to the chamber, together withindependent air control valves for the direct delivery means' and foreach of the channel systems.

4. A furnace construction comprising, in combination, channelledrefractory walls and a channelled refractory roof forming a combustionchamber, means for admitting fuel to the chamber, an oftake therefrom, aforced draft creating means, air inlet means and outlet means for thechannel system of said roof, separate air inlet and outlet means forsaid wall channels, direct air delivery means from said drafter to saidchamber, and means connecting said roofand wall channel systems withsaid drafter forming indirect air delivery means whereby air from theinlets is forced through said systems, for preheating it and Acoolingthe refractories, and by way of said outlets to the chamber, the airfrom said roof system being delivered adjacent the oil"- take, and theother air being delivered adjacent the center of combustion.

Signed at Long Island City,in the county of Queens and State of NewYork, this 12th day of November, A. D. 1925.

FRANK H. WAITE. GEORGE W. DAVEY.

a channelled refractory roof forming a com bustion chamber, means foradmitting fuel to the chamber, an oiftake therefrom, a forced draftcreating means, air inlet means and outlet means for the channel systemof said

